 
{:str_replace("world","Shanghai","Hello world!")}
{:str_replace("www","https",$Request.param.url)}
  您现在访问的是：{$Request.param.url} <a href="{:url('index/index/index')}">返回首页</a>   <a href="{:url('index/test/iframe','url=www.taobao.com')}">淘宝</a> 
  <a href="{:url('index/test/iframe','url=www.baidu.com')}">baidu</a> 
  <a href="{:url('index/test/iframe',['url'=>$Request.param.url])}">{$Request.param.url}</a> 
<iframe id="url_mainframe" style="height: 100%;
    visibility: inherit;
    width: 100%;
    z-index: 1;
    overflow: visible;" frameborder="0" scrolling="yes" name="main" src="http://{$Request.param.url}" style="height: 100%; visibility: inherit; width: 100%; z-index: 1;overflow: visible;"></iframe>
 
 